Comparing Relative Contrast in Three-dimensional Double-echo Steady State With Routine Sequences for a Better Diagnosis of Knee Cartilage Anomalies

Comparison of Three-Dimensional Double-Echo Steady-State Sequence with Routine Two-Dimensional Sequence in the Depiction of Knee Cartilage

Introduction: There are some routine two-dimensional sequences, including short tau inversion recovery (STIR), T2-weighted fast-spin echo (T2W-FSE), and proton-density fast spin-echo for diagnosing osteoarthritis and lesions of the knee cartilage. However, these sequences have some disadvantages, such as long scan time, inadequate spatial resolution, and suboptimal tis...

Steady-state diffusion-weighted imaging of in vivo knee cartilage.

Diffusion-weighted imaging (DWI) has strong potential as a diagnostic for early cartilage damage, with clinical impact for diseases such as osteoarthritis. However, in vivo DWI of cartilage has proven difficult with conventional methods due to the short T2. This work presents a 3D steady-state DWI sequence that is able to image short-T2 species with high SNR. When combined with 2D navigator cor...

Comparison Between Three-Dimensional Diffusion-Weighted PSIF Technique and Routine Imaging Sequences in Evaluation of Peripheral Nerves in Healthy People

Introduction: The present study aims to evaluate the Three-Dimensional Diffusion-Weighted reversed fast imaging with steady state free precession (3D DW-PSIF) sequence with respect to imaging of the peripheral nerves; the tibial, medial, and lateral plantar nerves in the lower extremity, ulnar and median nerve in the upper extremity, sciatic nerve, brachial plexus, and lumbosacral plexus, and a...

Contrast optimization of three-dimensional double-echo steady-state (3D-DESS) MR imaging of the spinal nerve root : a phantom study

A three-dimensional steady-state tumor system

The growth of tumors can be modeled as a free boundary problem involving partial differential equations. We consider one such model and compute steady-state solutions for this model. These solutions include radially symmetric solutions where the free boundary is a sphere and nonradially symmetric solutions. Linear and nonlinear stability for these solutions are determined numerically.

Navigated Steady-State Diffusion Imaging of Knee Cartilage

Diffusion-weighted imaging (DWI) of cartilage could potentially be useful in the detection or characterization of early damage. However, conventional DWI techniques often cannot achieve the short echo times required for cartilage, which has a short Tz. Steady-state DWI (SS-DWI) uses short echo times, and in combination with navigated motion correction, is capable of higher resolution than conve...